Trump is returning from his tour of Japan, China, South Korea, Vietnam and the Philippines. "We don't. I don't. I'm young. I'm insane, '" Colbert said during his late-night show. "We know what we're doing".
'I find out about them, ' he continued.
The president has been a prolific Twitter user since prior to his election; using the social media platform to push campaign messages, insult adversaries and question the policies of the previous administration.
Kelly said he focuses on his job instead of the content on Trump's Twitter account.
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Despite some calling it "unpresidential behavior", Trump has defended his Twitter use, claiming it's a way for him to fight back against "fake news".
The North Korean crisis was also top of the agenda with comments made by Kim Jong-un to Donald Trump still apparently hurting the President's feelings.
Trump has used Twitter to insult people, places and things on the campaign trail, to ratchet up his rhetoric about North Korea's nuclear program, to announce an impromptu, unvetted blanket ban on letting transgender individuals serve in the USA military, to attack members of the media and news outlets that publish unflattering coverage, and to alternately endorse and undercut members of his own caucus. After it was reported that the Kim Jong-un had called him "old and insane", Trump mocked the reclusive leader by tweeting that he'd "NEVER call him short and fat".
'That might be a odd thing to happen but it's a possibility, ' he said. Trump wrote as part of a series of tweets on Sunday morning in Vietnam.
Mr Trump and Mr Putin did not have a formal meeting while they were in Vietnam for the Asia-Pacific Economic Cooperation (Apec) summit, but the two spoke informally several times and reached an agreement on a number of principles for the future of war-torn Syria.